| /* |
| * Copyright (C) 2013 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.server.firewall; |
| |
| import android.content.ComponentName; |
| import android.content.Intent; |
| import android.content.pm.ApplicationInfo; |
| import android.net.Uri; |
| import org.xmlpull.v1.XmlPullParser; |
| import org.xmlpull.v1.XmlPullParserException; |
| |
| import java.io.IOException; |
| |
| class PortFilter implements Filter { |
| private static final String ATTR_EQUALS = "equals"; |
| private static final String ATTR_MIN = "min"; |
| private static final String ATTR_MAX = "max"; |
| |
| private static final int NO_BOUND = -1; |
| |
| // both bounds are inclusive |
| private final int mLowerBound; |
| private final int mUpperBound; |
| |
| private PortFilter(int lowerBound, int upperBound) { |
| mLowerBound = lowerBound; |
| mUpperBound = upperBound; |
| } |
| |
| @Override |
| public boolean matches(IntentFirewall ifw, ComponentName resolvedComponent, Intent intent, |
| int callerUid, int callerPid, String resolvedType, ApplicationInfo resolvedApp) { |
| int port = -1; |
| Uri uri = intent.getData(); |
| if (uri != null) { |
| port = uri.getPort(); |
| } |
| return port != -1 && |
| (mLowerBound == NO_BOUND || mLowerBound <= port) && |
| (mUpperBound == NO_BOUND || mUpperBound >= port); |
| } |
| |
| public static final FilterFactory FACTORY = new FilterFactory("port") { |
| @Override |
| public Filter newFilter(XmlPullParser parser) |
| throws IOException, XmlPullParserException { |
| int lowerBound = NO_BOUND; |
| int upperBound = NO_BOUND; |
| |
| String equalsValue = parser.getAttributeValue(null, ATTR_EQUALS); |
| if (equalsValue != null) { |
| int value; |
| try { |
| value = Integer.parseInt(equalsValue); |
| } catch (NumberFormatException ex) { |
| throw new XmlPullParserException("Invalid port value: " + equalsValue, |
| parser, null); |
| } |
| lowerBound = value; |
| upperBound = value; |
| } |
| |
| String lowerBoundString = parser.getAttributeValue(null, ATTR_MIN); |
| String upperBoundString = parser.getAttributeValue(null, ATTR_MAX); |
| if (lowerBoundString != null || upperBoundString != null) { |
| if (equalsValue != null) { |
| throw new XmlPullParserException( |
| "Port filter cannot use both equals and range filtering", |
| parser, null); |
| } |
| |
| if (lowerBoundString != null) { |
| try { |
| lowerBound = Integer.parseInt(lowerBoundString); |
| } catch (NumberFormatException ex) { |
| throw new XmlPullParserException( |
| "Invalid minimum port value: " + lowerBoundString, |
| parser, null); |
| } |
| } |
| |
| if (upperBoundString != null) { |
| try { |
| upperBound = Integer.parseInt(upperBoundString); |
| } catch (NumberFormatException ex) { |
| throw new XmlPullParserException( |
| "Invalid maximum port value: " + upperBoundString, |
| parser, null); |
| } |
| } |
| } |
| |
| // an empty port filter is explicitly allowed, and checks for the existence of a port |
| return new PortFilter(lowerBound, upperBound); |
| } |
| }; |
| } |